import Base from './Base';
import { walk, asyncRun, getNodeIndexInNodeList } from '../utils';
import { CONSTANTS } from '../constants/constant';

//  竖向时间轴
class VerticalTimeline extends Base {
    //  构造函数
    constructor(opt = {}, layout) {
        super(opt);
        this.layout = layout;
    }

    //  布局
    doLayout(callback) {
        let task = [
            () => {
                this.computedBaseValue();
            },
            () => {
                this.computedTopValue();
            },
            () => {
                this.adjustLeftTopValue();
            },
            () => {
                callback(this.root);
            },
        ];
        asyncRun(task);
    }

    //  遍历数据创建节点、计算根节点的位置，计算根节点的子节点的top值
    computedBaseValue() {
        walk(
            this.renderer.renderTree,
            null,
            (cur, parent, isRoot, layerIndex, index, ancestors) => {
                let newNode = this.createNode(
                    cur,
                    parent,
                    isRoot,
                    layerIndex,
                    index,
                    ancestors,
                );
                // 根节点定位在画布中心位置
                if (isRoot) {
                    this.setNodeCenter(newNode);
                } else {
                    // 非根节点
                    // 节点生长方向
                    // 三级及以下节点以上级为准
                    if (parent._node.dir) {
                        newNode.dir = parent._node.dir;
                    } else {
                        newNode.dir =
                            index % 2 === 0
                                ? CONSTANTS.LAYOUT_GROW_DIR.RIGHT
                                : CONSTANTS.LAYOUT_GROW_DIR.LEFT;
                    }
                    // 定位二级节点的left
                    if (parent._node.isRoot) {
                        newNode.left =
                            parent._node.left +
                            (cur._node.width > parent._node.width
                                ? -(cur._node.width - parent._node.width) / 2
                                : (parent._node.width - cur._node.width) / 2);
                    } else {
                        newNode.left =
                            newNode.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT
                                ? parent._node.left +
                                  parent._node.width +
                                  this.getMarginX(layerIndex)
                                : parent._node.left -
                                  this.getMarginX(layerIndex) -
                                  newNode.width;
                    }
                }
                if (!cur.data.expand) {
                    return true;
                }
            },
            (cur, parent, isRoot, layerIndex) => {
                // 返回时计算节点的areaHeight，也就是子节点所占的高度之和，包括外边距
                if (isRoot) {
                    return;
                }
                let len =
                    cur.data.expand === false ? 0 : cur._node.children.length;
                cur._node.childrenAreaHeight = len
                    ? cur._node.children.reduce((h, item) => {
                          return h + item.height;
                      }, 0) +
                      (len + 1) * this.getMarginY(layerIndex + 1)
                    : 0;
            },
            true,
            0,
        );
    }

    //  遍历节点树计算节点的top
    computedTopValue() {
        walk(
            this.root,
            null,
            (node, parent, isRoot, layerIndex, index) => {
                if (
                    node.getData('expand') &&
                    node.children &&
                    node.children.length
                ) {
                    let marginY = this.getMarginY(layerIndex + 1);
                    // 定位二级节点的top
                    if (isRoot) {
                        let top = node.top + node.height;
                        let totalTop = top + marginY;
                        node.children.forEach((cur) => {
                            cur.top = totalTop;
                            totalTop += cur.height + marginY;
                        });
                    } else {
                        // 定位三级及以下节点的top
                        let marginY = this.getMarginY(layerIndex + 1);
                        let baseTop = node.top + node.height / 2 + marginY;
                        // 第一个子节点的top值 = 该节点中心的top值 - 子节点的高度之和的一半
                        let totalTop = baseTop - node.childrenAreaHeight / 2;
                        node.children.forEach((cur) => {
                            cur.top = totalTop;
                            totalTop += cur.height + marginY;
                        });
                    }
                }
            },
            null,
            true,
        );
    }

    //  调整节点left、top
    adjustLeftTopValue() {
        walk(
            this.root,
            null,
            (node, parent, isRoot, layerIndex) => {
                if (!node.getData('expand')) {
                    return;
                }
                if (isRoot) return;
                // 判断子节点所占的高度之和是否大于该节点自身，大于则需要调整位置
                let base = this.getMarginY(layerIndex + 1) * 2 + node.height;
                let difference = node.childrenAreaHeight - base;
                if (difference > 0) {
                    this.updateBrothers(node, difference / 2);
                }
            },
            null,
            true,
        );
    }

    //  更新兄弟节点的top
    updateBrothers(node, addHeight) {
        if (node.parent) {
            let childrenList = node.parent.children;
            let index = getNodeIndexInNodeList(node, childrenList);
            childrenList.forEach((item, _index) => {
                // 自定义节点位置
                if (item.hasCustomPosition()) return;
                // 三级或三级以下节点自身位置不需要动
                if (!node.parent.isRoot && item.uid === node.uid) return;
                let _offset = 0;
                // 二级节点上面的兄弟节点不需要移动，自身需要往下移动
                if (node.parent.isRoot) {
                    // 上面的节点不用移
                    if (_index < index) {
                        _offset = 0;
                    } else if (_index > index) {
                        // 下面的节点往下移
                        _offset = addHeight * 2;
                    } else {
                        // 自身也要移动
                        _offset = addHeight;
                    }
                } else {
                    // 三级或三级以下节点两侧的兄弟节点向两侧移动
                    // 上面的节点往上移
                    if (_index < index) {
                        _offset = -addHeight;
                    } else if (_index > index) {
                        // 下面的节点往下移
                        _offset = addHeight;
                    }
                }
                item.top += _offset;
                // 同步更新子节点的位置
                if (item.children && item.children.length) {
                    this.updateChildren(item.children, 'top', _offset);
                }
            });
            // 更新父节点的位置
            this.updateBrothers(node.parent, addHeight);
        }
    }

    //  调整兄弟节点的top
    updateBrothersTop(node, addHeight) {
        if (node.parent && !node.parent.isRoot) {
            let childrenList = node.parent.children;
            let index = getNodeIndexInNodeList(node, childrenList);
            childrenList.forEach((item, _index) => {
                if (item.hasCustomPosition()) {
                    // 适配自定义位置
                    return;
                }
                let _offset = 0;
                // 下面的节点往下移
                if (_index > index) {
                    _offset = addHeight;
                }
                item.top += _offset;
                // 同步更新子节点的位置
                if (item.children && item.children.length) {
                    this.updateChildren(item.children, 'top', _offset);
                }
            });
            // 更新父节点的位置
            this.updateBrothersTop(node.parent, addHeight);
        }
    }

    //  绘制连线，连接该节点到其子节点
    renderLine(node, lines, style, lineStyle) {
        if (lineStyle === 'curve') {
            this.renderLineCurve(node, lines, style);
        } else if (lineStyle === 'direct') {
            this.renderLineDirect(node, lines, style);
        } else {
            this.renderLineStraight(node, lines, style);
        }
    }

    // 直线连接
    renderLineStraight(node, lines, style) {
        if (node.children.length <= 0) {
            return [];
        }
        let { expandBtnSize } = node;
        const { alwaysShowExpandBtn, notShowExpandBtn } = this.mindMap.opt;
        if (!alwaysShowExpandBtn || notShowExpandBtn) {
            expandBtnSize = 0;
        }
        if (node.isRoot) {
            // 当前节点是根节点
            let prevBother = node;
            // 根节点的子节点是和根节点同一水平线排列
            node.children.forEach((item, index) => {
                let y1 = prevBother.top + prevBother.height;
                let y2 = item.top;
                let x = node.left + node.width / 2;
                let path = `M ${x},${y1} L ${x},${y2}`;
                this.setLineStyle(style, lines[index], path, item);
                prevBother = item;
            });
        } else {
            // 当前节点为非根节点
            if (node.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT) {
                let nodeRight = node.left + node.width;
                let nodeYCenter = node.top + node.height / 2;
                let marginX = this.getMarginX(node.layerIndex + 1);
                let offset = (marginX - expandBtnSize) * 0.6;
                node.children.forEach((item, index) => {
                    let itemLeft = item.left;
                    let itemYCenter = item.top + item.height / 2;
                    let path = this.createFoldLine([
                        [nodeRight, nodeYCenter],
                        [nodeRight + offset, nodeYCenter],
                        [nodeRight + offset, itemYCenter],
                        [itemLeft, itemYCenter],
                    ]);
                    this.setLineStyle(style, lines[index], path, item);
                });
            } else {
                let nodeLeft = node.left;
                let nodeYCenter = node.top + node.height / 2;
                let marginX = this.getMarginX(node.layerIndex + 1);
                let offset = (marginX - expandBtnSize) * 0.6;
                node.children.forEach((item, index) => {
                    let itemRight = item.left + item.width;
                    let itemYCenter = item.top + item.height / 2;
                    let path = this.createFoldLine([
                        [nodeLeft, nodeYCenter],
                        [nodeLeft - offset, nodeYCenter],
                        [nodeLeft - offset, itemYCenter],
                        [itemRight, itemYCenter],
                    ]);
                    this.setLineStyle(style, lines[index], path, item);
                });
            }
        }
    }

    // 直连
    renderLineDirect(node, lines, style) {
        if (node.children.length <= 0) {
            return [];
        }
        let { left, top, width, height, expandBtnSize } = node;
        const { alwaysShowExpandBtn, notShowExpandBtn } = this.mindMap.opt;
        if (!alwaysShowExpandBtn || notShowExpandBtn) {
            expandBtnSize = 0;
        }
        node.children.forEach((item, index) => {
            if (node.isRoot) {
                let prevBother = node;
                // 根节点的子节点是和根节点同一水平线排列
                node.children.forEach((item, index) => {
                    let y1 = prevBother.top + prevBother.height;
                    let y2 = item.top;
                    let x = node.left + node.width / 2;
                    let path = `M ${x},${y1} L ${x},${y2}`;
                    this.setLineStyle(style, lines[index], path, item);
                    prevBother = item;
                });
            } else {
                let x1 =
                    item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
                        ? left - expandBtnSize
                        : left + width + expandBtnSize;
                let y1 = top + height / 2;
                let x2 =
                    item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
                        ? item.left + item.width
                        : item.left;
                let y2 = item.top + item.height / 2;
                let path = `M ${x1},${y1} L ${x2},${y2}`;
                this.setLineStyle(style, lines[index], path, item);
            }
        });
    }

    //  曲线风格连线
    renderLineCurve(node, lines, style) {
        if (node.children.length <= 0) {
            return [];
        }
        let { left, top, width, height, expandBtnSize } = node;
        const { alwaysShowExpandBtn, notShowExpandBtn } = this.mindMap.opt;
        if (!alwaysShowExpandBtn || notShowExpandBtn) {
            expandBtnSize = 0;
        }
        node.children.forEach((item, index) => {
            if (node.isRoot) {
                let prevBother = node;
                // 根节点的子节点是和根节点同一水平线排列
                node.children.forEach((item, index) => {
                    let y1 = prevBother.top + prevBother.height;
                    let y2 = item.top;
                    let x = node.left + node.width / 2;
                    let path = `M ${x},${y1} L ${x},${y2}`;
                    this.setLineStyle(style, lines[index], path, item);
                    prevBother = item;
                });
            } else {
                let x1 =
                    item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
                        ? left - expandBtnSize
                        : left + width + expandBtnSize;
                let y1 = top + height / 2;
                let x2 =
                    item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
                        ? item.left + item.width
                        : item.left;
                let y2 = item.top + item.height / 2;
                let path = this.cubicBezierPath(x1, y1, x2, y2);
                this.setLineStyle(style, lines[index], path, item);
            }
        });
    }

    //  渲染按钮
    renderExpandBtn(node, btn) {
        let { width, height, expandBtnSize, isRoot } = node;
        if (!isRoot) {
            let { translateX, translateY } = btn.transform();
            if (node.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT) {
                btn.translate(width - translateX, height / 2 - translateY);
            } else {
                btn.translate(
                    -expandBtnSize - translateX,
                    height / 2 - translateY,
                );
            }
        }
    }

    //  创建概要节点
    renderGeneralization(list) {
        list.forEach((item) => {
            let isLeft = item.node.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT;
            let {
                top,
                bottom,
                left,
                right,
                generalizationLineMargin,
                generalizationNodeMargin,
            } = this.getNodeGeneralizationRenderBoundaries(item, 'h');
            let x = isLeft
                ? left - generalizationLineMargin
                : right + generalizationLineMargin;
            let x1 = x;
            let y1 = top;
            let x2 = x;
            let y2 = bottom;
            let cx = x1 + (isLeft ? -20 : 20);
            let cy = y1 + (y2 - y1) / 2;
            let path = `M ${x1},${y1} Q ${cx},${cy} ${x2},${y2}`;
            item.generalizationLine.plot(this.transformPath(path));
            item.generalizationNode.left =
                x +
                (isLeft
                    ? -generalizationNodeMargin
                    : generalizationNodeMargin) -
                (isLeft ? item.generalizationNode.width : 0);
            item.generalizationNode.top =
                top + (bottom - top - item.generalizationNode.height) / 2;
        });
    }

    // 渲染展开收起按钮的隐藏占位元素
    renderExpandBtnRect(rect, expandBtnSize, width, height, node) {
        if (node.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT) {
            rect.size(expandBtnSize, height).x(-expandBtnSize).y(0);
        } else {
            rect.size(expandBtnSize, height).x(width).y(0);
        }
    }
}

export default VerticalTimeline;
